Ultrafast spin-to-charge conversions of antiferromagnetic (111)-oriented $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$

TL;DR

This study investigates the ultrafast spin-to-charge conversion in antiferromagnetic Mn3Ir, revealing its potential as a spintronic THz emitter and providing new insights into its THz spin transport properties.

Contribution

It is the first to measure THz emission from Mn3Ir and determine its spin Hall angle, demonstrating its potential for ultrafast spintronic applications.

Findings

Spin Hall angle approximately 0.035 in 0.3-2.2 THz range

Demonstrated THz emission from Mn3Ir multilayers

Provided insights into THz spin transport in Mn3Ir

Abstract

Antiferromagnetic $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ combines outstanding spin-transport properties with magnons in the terahertz (THz) frequency range. However, the THz radiation emitted by ultrafast spin-to-charge conversion via the inverse spin Hall effect remains unexplored. In this study, we measured the THz emission and transmission of a permalloy/(111)-oriented $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ multilayer by THz time-domain spectroscopy. The spin Hall angle was determined to be approximately constant at 0.035 within a frequency range of 0.3-2.2 THz, in comparison with the THz spectroscopy of a permalloy/Pt multilayer. Our results not only demonstrate the potential of $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$ as a spintronic THz emitter but also provide insights into the THz spin transport properties of $\mathrm{L1_2}$-$\mathrm{Mn_3Ir}$.